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AssigneeU.S. Philips Corporation
InventorsLevinus P. Bakker, Gerardus M. W. Kroesen
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The invention relates to a method of adjusting a desired spectrum of light emitted by a gas discharge lamp during its operation, said gas discharge lamp comprising a first ionizable substance and a second substance which is less readily ionizable than the first substance. According to the invention, the gas discharge lamp is operated such that gases of both substances cans be excited, while the partial pressure of the first substance is adjusted in dependence on the desired spectrum. For this purpose, for example, the current through the lamp may be modulated. In an alternative embodiment, this is suitably achieved in that the partial mercury pressure is varied, for example through an adjustment of the temperature of a mercury amalgam present in the gas discharge lamp. The invention also relates to a gas discharge lamp whose color can be varied during its operation, and to a luminaire provided with a supply for such a lamp.
A method of adjusting a desired spectrum of the light emitted by a gas discharge lamp during its operation, wherein the gas discharge lamp comprises a discharge chamber closed in a gastight manner with a first ionizable substance and a second substance less readily ionizable than said first substance both present in the discharge chamber, at least a portion of the first and of the second substance being in the gas state during operation, and which gas discharge lamp is operated under voltage and current conditions such that at least the gas of the first substance can be ionized and the second substance can be excited, the ratio of i) the partial pressure of the first substance to ii) the partial pressure of the second substance being adjusted in dependence on the desired spectrum, one of said substances in the gas state directly emitting visible light under said voltage and current conditions.
A gas discharge lamp which comprises a discharge chamber which is closed in a gastight manner with a first ionizable substance and a second substance less readily ionizable than said first substance in the discharge chamber, while at least a portion of the first and the second substance are capable of being in the gas phase during operation, the gas discharge lamp being provided with means for modifying the ratio of the partial pressures of the light-emitting gases with respect to a preset value, one of said substances in the gas state directly emitting visible light during operation of the lamp at said preset value.
A luminaire for a gas discharge lamp is provided with a means for modifying the ratio of the partial pressures of the light-emitting gases with respect to a preset value comprising a supply unit having a circuit for controlling a current chosen from a group comprising i) a direct current and ii) an alternating current
A method of adjusting a desired spectrum of the light emitted by a gas discharge lamp during its operation, wherein the gas discharge lamp comprises a discharge chamber closed in a gastight manner with a first ionizable substance and a second substance less readily ionizable than said first substance both present in the discharge chamber, at least a portion of the first and of the second substance being in the gas state during operation, and the gas discharge lamp having no more than a first and a second electrode, said first and second electrodes applying a single electric field to the first and second substances and being operated under voltage and current conditions such that at least the gas of the first substance can be ionized and the second substance can be excited, the ratio of i) the partial pressure of the first substance to ii) the partial pressure of the second substance being adjusted in dependence on the desired spectrum.
A gas discharge lamp which comprises a discharge chamber which is closed in a gastight manner with a first ionizable substance and a second substance less readily ionizable than said first substance in the discharge chamber, while at least a portion of the first and the second substance are capable of being in the gas phase during operation, and electrodes consisting of a first electrode and a second electrode, said first and second electrodes applying a single electric field in the discharge chamber, the gas discharge lamp being provided with means for modifying the ratio of the partial pressures of the light-emitting gases with respect to a preset value.
A method of configuring a gas discharge lamp to emit light of a desired color and a desired luminous flux, comprising:
A gas discharge lamp comprising:
Dependencies are inferred from the claim text.